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This article in AJ

  1. Vol. 85 No. 2, p. 354-358
    Received: Aug 20, 1990

    * Corresponding author(s):
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Parameterized Model of Gramineous Crop Growth: II. Within-Season Simulation Calibration

  1. Stephan J. Maas 
  1. USDA-ARS, Subtropical Agric. Res. Lab., 2413 East Highway 83, Weslaco, TX 78596-8344



The accuracy of parameterized crop growth models is dependent on obtaining the proper parameter values that control the response of the model to environmental conditions. In this study, a method is described for objectively evaluating model parameters based on observations of crop growth obtained during the growing season. An iterative numerical procedure is used to systematically manipulate the values of selected parameters and initial conditions until the model simulation matches the observations of growth. Examples involving a previously-developed growth model indicate that reasonably accurate simulations can be made for three gramineous crops (grain sorghum, corn, and spring wheat) by calibrating a set of parameters and initial conditions that affect leaf area appearance and senescence. It is proposed that the effectiveness of this procedure in using infrequent growth observations and the ability to obtain these observations using nondestructive measurement techniques make this modelling procedure feasible for use in practical agricultural applications.

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